body {
  background-size: cover;
  color: black;
  font-family: Calibri;
  text-align: center;
}

H1{
  color:blue;
  text-align: center;
  background-color:red;
  
h1{
  color:blue;
  text-align: center;
}
h2{
  color:black;
  background-color:red;
  text-align: center;
}
p{
  text-align:center;
}

button{
  text-align:center;
}

h3{
  text-align:left;
  color:black;
  background-color:red;
}
h4{
  text-align:center;
  color:red;
  background-color:yellow;
}